content/renderer/pepper/pepper_video_decoder_host.h

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_DECODER_HOST_H_
   6 #define CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_DECODER_HOST_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/containers/hash_tables.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/memory/scoped_vector.h"
  17 #include "content/common/content_export.h"
  18 #include "media/video/video_decode_accelerator.h"
  19 #include "ppapi/c/pp_codecs.h"
  20 #include "ppapi/host/host_message_context.h"
  21 #include "ppapi/host/resource_host.h"
  22 #include "ppapi/proxy/resource_message_params.h"
  23
  24 namespace base {
  25 class SharedMemory;
  26 }
  27
  28 namespace content {
  29
  30 class PPB_Graphics3D_Impl;
  31 class RendererPpapiHost;
  32 class RenderViewImpl;
  33 class VideoDecoderShim;
  34
  35 class CONTENT_EXPORT PepperVideoDecoderHost
  36     : public ppapi::host::ResourceHost,
  37       public media::VideoDecodeAccelerator::Client {
  38  public:
  39   PepperVideoDecoderHost(RendererPpapiHost* host,
  40                          PP_Instance instance,
  41                          PP_Resource resource);
  42   ~PepperVideoDecoderHost() override;
  43
  44  private:
  45   enum class PictureBufferState {
  46     ASSIGNED,
  47     IN_USE,
  48     DISMISSED,
  49   };
  50
  51   struct PendingDecode {
  52     PendingDecode(int32_t decode_id,
  53                   uint32_t shm_id,
  54                   uint32_t size,
  55                   const ppapi::host::ReplyMessageContext& reply_context);
  56     ~PendingDecode();
  57
  58     const int32_t decode_id;
  59     const uint32_t shm_id;
  60     const uint32_t size;
  61     const ppapi::host::ReplyMessageContext reply_context;
  62   };
  63   typedef std::list<PendingDecode> PendingDecodeList;
  64
  65   friend class VideoDecoderShim;
  66
  67   // ResourceHost implementation.
  68   int32_t OnResourceMessageReceived(
  69       const IPC::Message& msg,
  70       ppapi::host::HostMessageContext* context) override;
  71
  72   // media::VideoDecodeAccelerator::Client implementation.
  73   void ProvidePictureBuffers(uint32 requested_num_of_buffers,
  74                              const gfx::Size& dimensions,
  75                              uint32 texture_target) override;
  76   void DismissPictureBuffer(int32 picture_buffer_id) override;
  77   void PictureReady(const media::Picture& picture) override;
  78   void NotifyEndOfBitstreamBuffer(int32 bitstream_buffer_id) override;
  79   void NotifyFlushDone() override;
  80   void NotifyResetDone() override;
  81   void NotifyError(media::VideoDecodeAccelerator::Error error) override;
  82
  83   int32_t OnHostMsgInitialize(ppapi::host::HostMessageContext* context,
  84                               const ppapi::HostResource& graphics_context,
  85                               PP_VideoProfile profile,
  86                               PP_HardwareAcceleration acceleration,
  87                               uint32_t min_picture_count);
  88   int32_t OnHostMsgGetShm(ppapi::host::HostMessageContext* context,
  89                           uint32_t shm_id,
  90                           uint32_t shm_size);
  91   int32_t OnHostMsgDecode(ppapi::host::HostMessageContext* context,
  92                           uint32_t shm_id,
  93                           uint32_t size,
  94                           int32_t decode_id);
  95   int32_t OnHostMsgAssignTextures(ppapi::host::HostMessageContext* context,
  96                                   const PP_Size& size,
  97                                   const std::vector<uint32_t>& texture_ids);
  98   int32_t OnHostMsgRecyclePicture(ppapi::host::HostMessageContext* context,
  99                                   uint32_t picture_id);
 100   int32_t OnHostMsgFlush(ppapi::host::HostMessageContext* context);
 101   int32_t OnHostMsgReset(ppapi::host::HostMessageContext* context);
 102
 103   // These methods are needed by VideoDecodeShim, to look like a
 104   // VideoDecodeAccelerator.
 105   const uint8_t* DecodeIdToAddress(uint32_t decode_id);
 106   void RequestTextures(uint32 requested_num_of_buffers,
 107                        const gfx::Size& dimensions,
 108                        uint32 texture_target,
 109                        const std::vector<gpu::Mailbox>& mailboxes);
 110
 111   // Tries to initialize software decoder. Returns true on success.
 112   bool TryFallbackToSoftwareDecoder();
 113
 114   PendingDecodeList::iterator GetPendingDecodeById(int32_t decode_id);
 115
 116   // Non-owning pointer.
 117   RendererPpapiHost* renderer_ppapi_host_;
 118
 119   media::VideoCodecProfile profile_;
 120
 121   scoped_ptr<media::VideoDecodeAccelerator> decoder_;
 122
 123   bool software_fallback_allowed_ = false;
 124   bool software_fallback_used_ = false;
 125
 126   // A vector holding our shm buffers, in sync with a similar vector in the
 127   // resource. We use a buffer's index in these vectors as its id on both sides
 128   // of the proxy. Only add buffers or update them in place so as not to
 129   // invalidate these ids.
 130   ScopedVector<base::SharedMemory> shm_buffers_;
 131   // A vector of true/false indicating if a shm buffer is in use by the decoder.
 132   // This is parallel to |shm_buffers_|.
 133   std::vector<uint8_t> shm_buffer_busy_;
 134
 135   uint32_t min_picture_count_;
 136   typedef std::map<uint32_t, PictureBufferState> PictureBufferMap;
 137   PictureBufferMap picture_buffer_map_;
 138
 139   // Keeps list of pending decodes.
 140   PendingDecodeList pending_decodes_;
 141
 142   ppapi::host::ReplyMessageContext flush_reply_context_;
 143   ppapi::host::ReplyMessageContext reset_reply_context_;
 144
 145   bool initialized_ = false;
 146
 147   DISALLOW_COPY_AND_ASSIGN(PepperVideoDecoderHost);
 148 };
 149
 150 }  // namespace content
 151
 152 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_DECODER_HOST_H_